diff --git a/docs/cooperation/cooperation-schema.yaml b/docs/cooperation/cooperation-schema.yaml
index 765520c6..20ec1f4b 100644
--- a/docs/cooperation/cooperation-schema.yaml
+++ b/docs/cooperation/cooperation-schema.yaml
@@ -11,9 +11,33 @@ definitions:
           items:
             type: string
         subject:
-          type: string
+          type: object
+          properties:
+            name:
+              type: string
         category:
-          type: string
+          type: object
+          properties:
+            appearance:
+              type: object
+              properties:
+                color:
+                  type: string
+                icon:
+                  type: string
+        user:
+          type: object
+          properties:
+            _id:
+              type: string
+            firstName:
+              type: string
+            lastName:
+              type: string
+            photo:
+              type: string
+            role:
+              type: string
         description:
           type: string
         languages:
@@ -59,26 +83,15 @@ definitions:
         type: string
       offer:
         type: string
+        ref: '#components/offer'
       initiator:
         type: string
+        ref: '#/components/user'
       initiatorRole:
         type: string
-      proficiencyLevel:
-        type: array
-        items:
-          type: string
-      subject:
-        type: string
-      category:
-        type: string
-      description:
-        type: string
-      languages:
-        type: array
-        items:
-          type: string
       receiver:
         type: string
+        ref: '#components/user'
       receiverRole:
         type: string
       price:
@@ -207,28 +220,11 @@ definitions:
         properties:
           _id:
             type: string
-          proficiencyLevel:
-            type: array
-            items:
-              type: string
-          title:
-            type: string
-          description:
-            type: string
-          languages:
-            type: array
-            items:
-              type: string
           author:
             type: object
             properties:
-              totalReviews:
-                type: object
-                properties:
-                  student:
-                    type: integer
-                  tutor:
-                    type: integer
+              _id:
+                type: string
               averageRating:
                 type: object
                 properties:
@@ -236,8 +232,6 @@ definitions:
                     type: number
                   tutor:
                     type: number
-              _id:
-                type: string
               firstName:
                 type: string
               lastName:
@@ -246,246 +240,57 @@ definitions:
                 type: string
               professionalSummary:
                 type: string
-          subject:
-            type: object
-            properties:
-              _id:
-                type: string
-              name:
-                type: string
-          category:
-            type: object
-            properties:
-              appearance:
+              totalReviews:
                 type: object
                 properties:
-                  color:
-                    type: string
-                  icon:
-                    type: string
-              _id:
-                type: string
-              name:
-                type: string
+                  student:
+                    type: number
+                  tutor:
+                    type: number
       initiator:
+        type: string
+      initiatorRole:
+        type: string
+      proficiencyLevel:
+        type: array
+        items:
+          type: string
+      subject:
         type: object
         properties:
-          address:
-            type: object
-            properties:
-              country:
-                type: string
-              city:
-                type: string
-          mainSubjects:
-            type: object
-            properties:
-              student:
-                type: array
-                items:
-                  type: string
-              tutor:
-                type: array
-                items:
-                  type: string
-          totalReviews:
-            type: object
-            properties:
-              student:
-                type: integer
-              tutor:
-                type: integer
-          averageRating:
-            type: object
-            properties:
-              student:
-                type: number
-              tutor:
-                type: number
-          status:
-            type: object
-            properties:
-              student:
-                type: string
-              tutor:
-                type: string
-              admin:
-                type: string
-          videoLink:
-            type: object
-            properties:
-              student:
-                type: string
-          professionalBlock:
-            type: object
-            properties:
-              awards:
-                type: string
-              scientificActivities:
-                type: string
-              workExperience:
-                type: string
-              education:
-                type: string
-          notificationSettings:
-            type: object
-            properties:
-              isOfferStatusNotification:
-                type: boolean
-              isChatNotification:
-                type: boolean
-              isSimilarOffersNotification:
-                type: boolean
-              isEmailNotification:
-                type: boolean
-          _id:
-            type: string
-          role:
-            type: array
-            items:
-              type: string
-          firstName:
-            type: string
-          lastName:
-            type: string
-          email:
+          name:
             type: string
-          nativeLanguage:
-            type: string
-          lastLogin:
-            type: string
-          createdAt:
-            type: string
-          updatedAt:
-            type: string
-          professionalSummary:
-            type: string
-      initiatorRole:
-        type: string
-      receiver:
+      category:
         type: object
         properties:
-          address:
+          appearance:
             type: object
             properties:
-              country:
+              color:
                 type: string
-              city:
+              icon:
                 type: string
-          mainSubjects:
-            type: object
-            properties:
-              student:
-                type: array
-                items:
-                  type: string
-              tutor:
-                type: array
-                items:
-                  type: object
-                  properties:
-                    category:
-                      type: string
-                    subjects:
-                      type: array
-                      items:
-                        type: string
-                    _id:
-                      type: string
-          totalReviews:
-            type: object
-            properties:
-              student:
-                type: integer
-              tutor:
-                type: integer
-          averageRating:
-            type: object
-            properties:
-              student:
-                type: number
-              tutor:
-                type: number
-          status:
-            type: object
-            properties:
-              student:
-                type: string
-              tutor:
-                type: string
-              admin:
-                type: string
-          videoLink:
-            type: object
-            properties:
-              tutor:
-                type: string
-          professionalBlock:
-            type: object
-            properties:
-              awards:
-                type: string
-              scientificActivities:
-                type: string
-              workExperience:
-                type: string
-              education:
-                type: string
-          notificationSettings:
-            type: object
-            properties:
-              isOfferStatusNotification:
-                type: boolean
-              isChatNotification:
-                type: boolean
-              isSimilarOffersNotification:
-                type: boolean
-              isEmailNotification:
-                type: boolean
-          _id:
-            type: string
-          role:
-            type: array
-            items:
-              type: string
-          firstName:
-            type: string
-          lastName:
-            type: string
-          email:
-            type: string
-          nativeLanguage:
-            type: string
-          lastLogin:
-            type: string
-          createdAt:
-            type: string
-          updatedAt:
-            type: string
-          photo:
-            type: string
-          professionalSummary:
-            type: string
-      receiverRole:
+      description:
         type: string
-      title:
+      languages:
+        type: array
+        items:
+          type: string
+      receiver:
         type: string
-      proficiencyLevel:
+      receiverRole:
         type: string
       price:
-        type: integer
-      status:
+        type: number
+      title:
         type: string
-      needAction:
+      status:
         type: string
-      availableQuizzes:
-        type: array
-        items:
-          type: string
-      finishedQuizzes:
-        type: array
-        items:
-          type: string
+        enum:
+          - pending
+          - active
+          - declined
+          - closed
       sections:
         type: array
         items:
@@ -523,7 +328,14 @@ definitions:
                         type: string
                         format: date-time
                         default: null
+      needAction:
+        type: string
+        enum:
+          - student
+          - tutor
       createdAt:
         type: string
+        format: date-time
       updatedAt:
         type: string
+        format: date-time
diff --git a/docs/cooperation/cooperation.yaml b/docs/cooperation/cooperation.yaml
index d2e0e589..e8fe656d 100644
--- a/docs/cooperation/cooperation.yaml
+++ b/docs/cooperation/cooperation.yaml
@@ -25,8 +25,16 @@ paths:
                   receiverRole: student
                   title: 'Violin lessons'
                   proficiencyLevel: ['Intermediate']
-                  subject: 6255bc080a75adf9223df101
-                  category: 6255bc080a75adf9223df102
+                  subject: { name: 'Music' }
+                  category: { appearance: { color: '#E3B21C', icon: 'ScienceRoundedIcon' } }
+                  user:
+                    {
+                      _id: '66b0aecdadd1fe775238c7d5',
+                      firstName: 'Pavlo',
+                      lastName: 'Dolia',
+                      photo: '1726302778023-pexels-olly-3769706.jpg',
+                      role: 'student'
+                    }
                   description: "I'll teach you how to play violin"
                   languages: ['English']
                   price: 200
@@ -45,8 +53,16 @@ paths:
                   receiverRole: student
                   title: 'Violin lessons'
                   proficiencyLevel: ['Intermediate']
-                  subject: 6255bc080a75adf9223df103
-                  category: 6255bc080a75adf9223df104
+                  subject: { name: 'Music' }
+                  category: { appearance: { color: '#E3B21C', icon: 'ScienceRoundedIcon' } }
+                  user:
+                    {
+                      _id: '66b0aecdadd1fe775238c7d5',
+                      firstName: 'Pavlo',
+                      lastName: 'Dolia',
+                      photo: '1726302778023-pexels-olly-3769706.jpg',
+                      role: 'student'
+                    }
                   description: "I'll teach you how to play violin"
                   languages: ['English']
                   price: 300
@@ -189,40 +205,22 @@ paths:
                 _id: 8755bc080a00adr9243df106
                 description: "I'll teach you how to play violin"
                 languages: ['English']
-                subject: '656605be8bebd72f0be55a3d'
-                category: '6566040f8bebd72f0be55a28'
+                subject: { name: 'Music' }
+                category: { appearance: { color: '#E3B21C', icon: 'ScienceRoundedIcon' } }
                 offer:
-                  _id: 63ebc6fbd2f34037d0aba791
-                  proficiencyLevel:
-                    - Intermediate
-                    - Advanced
-                    - Test Preparation
-                    - Professional
-                  title: 'Understanding Quadratic Equations'
-                  description: "In this lesson, we will delve into the world of quadratic equations. We'll explore the standard form of a quadratic equation, learn how to identify the coefficients, and understand the significance of the discriminant. Students will also practice solving quadratic equations using various methods, including factoring, completing the square, and the quadratic formula. By the end of the lesson, students will be able to solve quadratic equations confidently and understand their graphical representations."
-                  languages:
-                    - English
-                  author:
-                    totalReviews:
-                      student: 0
-                      tutor: 0
-                    averageRating:
-                      student: 0
-                      tutor: 0
-                    _id: 6658f73f93885febb491e08b
-                    firstName: 'John'
-                    lastName: 'Doe'
-                    photo: '6658f73f93885-test_student.png'
-                    professionalSummary: 'I am student of the University of Cambridge. I am passionate about learning mathematics.'
-                  subject:
-                    _id: 6566133a2bccdd3e18dbe943
-                    name: 'Algebra'
-                  category:
-                    appearance:
-                      color: '#E3B21C'
-                      icon: 'TagRoundedIcon'
-                    _id: '64884f33fdc2d1a130c24ac2'
-                    name: 'Mathematics'
+                  {
+                    _id: 63ebc6fbd2f34037d0aba791,
+                    author:
+                      {
+                        _id: '66a7abbab3168fa64a8f5af1',
+                        averageRating: { student: 0, tutor: 0 },
+                        firstName: 'John',
+                        lastName: 'Doe',
+                        photo: '1726302583778-pexels-vanessa-garcia-6326377.jpg',
+                        professionalSummary: 'I have 12 years of experience',
+                        totalReviews: { student: 0, tutor: 0 }
+                      }
+                  }
                 initiator:
                   address:
                     country: 'USA'